/// <summary>
/// 升级表补充缺失的列
/// </summary>
/// <param name="map"></param>
private void MigrateTable(TableMapping map)
{
try
{
var existingCols = GetTableInfo(map.TableName);
var toBeAdded = new List <TableMapping.Column>();
foreach (var p in map.Columns)
{
var found = false;
foreach (var c in existingCols)
{
found = (string.Compare(p.Name, c.Name, StringComparison.OrdinalIgnoreCase) == 0);
if (found)
{
break;
}
}
if (!found)
{
toBeAdded.Add(p);
}
}
foreach (var p in toBeAdded)
{
var addCol = string.Format("ALTER TABLE \"{0}\" ADD COLUMN {1}", map.TableName, Orm.SqlDecl(p, StoreDateTimeAsTicks));
Execute(addCol);
}
}
catch (Exception ex)
{
LogHelper.LogError("SQLiteMapping-MigrateTable-TableName:{0}-ex:{1}", map.TableName, ex);
ex = null;
}
}
/// <summary>
/// Internal CreateTable
/// </summary>
/// <param name="map"></param>
/// <returns></returns>
private int InternalCreateTable(TableMapping map)
{
if (map == null)
{
throw new ArgumentNullException("map");
}
var query = string.Format("CREATE TABLE IF NOT EXISTS \"{0}\"(\n", map.TableName);
var pks = map.PKs;
var isConstraintPKs = pks != null && pks.Length > 1; //复合主键
var decls = map.Columns.Select(p => Orm.SqlDecl(p, StoreDateTimeAsTicks, isConstraintPKs));
query += string.Join(",\n", decls.ToArray());
if (isConstraintPKs)//处理复合主键
{
query += Orm.SqlDeclPKs(map.PKs);
}
query += ");";
var count = Execute(query);
if (count == 0 || count == -1) //不同版本的 System.Data.SQLite.dll 返回的结果不一样, 老版本永远返回 0 , 新版本永远返回 -1
{ //Possible bug: This always seems to return 0?
// Table already exists, migrate it
MigrateTable(map);
}
var indexes = new Dictionary <string, IndexInfo>();
foreach (var c in map.Columns)
{
foreach (var i in c.Indices)
{
var iname = i.Name ?? map.TableName + "_" + c.Name;
IndexInfo iinfo;
if (!indexes.TryGetValue(iname, out iinfo))
{
iinfo = new IndexInfo
{
IndexName = iname,
TableName = map.TableName,
Unique = i.Unique,
Columns = new List <IndexedColumn>()
};
indexes.Add(iname, iinfo);
}
if (i.Unique != iinfo.Unique)
{
throw new Exception("All the columns in an index must have the same value for their Unique property");
}
iinfo.Columns.Add(new IndexedColumn
{
Order = i.Order,
ColumnName = c.Name
});
}
}
foreach (var indexName in indexes.Keys)
{
var index = indexes[indexName];
var columns = String.Join("\",\"", index.Columns.OrderBy(i => i.Order).Select(i => i.ColumnName).ToArray());
count += CreateIndex(indexName, index.TableName, columns, index.Unique);
}
return(count);
}
